Tell them their incredible power and subsequent broken strings mandates a back-up to the back-up. Or, on the other hand, their inability to hit anything other than framed shots requires the same thing.

1. experimental setup or something different when the match isn't going ur way.
2. backup stick when too lazy to string for next day's match.
3. sweaty grip change up stick.
4. or like me, just like to change up sticks every 30 minutes out of boredom of using same stick.

I have a 3rd racquet in my bag that is my "insurance policy". If I'm playing a big tournament and I somehow break the strings on both my primary racquets, I have something to fall back on instead of retiring the match.

Third racquet would idea for someone who plays tennis on a daily basis and is all tennis. But you have to remember that if you switch racquet with marketing of the racquet manufacturers it becomes an expensive practice. If you are good enough to stick with one racquet like the touring pros - going from teenager to touring pro with the exact same racquet then go ahead and accumulate your racquet.

Situation 1: If you don't string for yourself, (and play least 2-3 times a week or more) you need three frames. The turnaround time to drop off and pick up a fresh string job at a pro shop can be 2-4 days. If you only play with two racquets, and one happens to be in the shop, then you are down to 1 frame. If you break a string on that one frame you will have to borrow a racquet from a nearby court or your opponent to finish play. If you have three, then one can be in the shop and you are not stressing about turn around timing.

Situation 2: If you prefer to play with Gut, or gut hybrid, and you play outdoors, you should have three frames. Two with gut, and one with no gut at all as a back up plan for rainy or damp conditions.

i'd second, third, forth, whatever the comments made about the benefits of having a different tension available. I find its convenient to change up my "rig" based on the conditions. if you find yourself playing mostly outdoors but go indoors for a month or two then you could have an "indoor" stick with different string or tension. you could drop the tension a bit in the third one if you played at night or outdoors in cooler temps. many possibilities...

during competitive play, you can get a little excited and swing funny and hit it out more, thus a somewhat tighter string job is a good thing to have handy.

And it's also a good idea to have a looser strung frame, should you decide to play on clay.

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These. If you're a competitive player, the ability to have matched rackets with 2 or 3 different tensions cannot be underrated. In my case, my main sticks are all gut poly, at 3 different tensions. Which one I use will depend on things like my opponent, how much energy I have left in the tank, the state of the balls, the weather, and the surface. My backups are there for inclement weather and string experimentation.

Being able to go to a looser strung racket in the third set when the balls are dead or dying can translate into a huge advantage.